Update hspec-wai to 0.8.0 (#799)

test/Feature/UnicodeSpec.hs

@@ -6,6 +6,8 @@ import Test.Hspec.Wai.JSON
 import Network.Wai (Application)
 import Control.Monad (void)
 
+import SpecHelper
+
 import Protolude hiding (get)
 
 spec :: SpecWith Application
@@ -20,3 +22,4 @@ spec =
 
       get "/%D9%85%D9%88%D8%A7%D8%B1%D8%AF"
         `shouldRespondWith` [json| [{ "هویت": 1 }] |]
+        { matchHeaders = [matchContentTypeJson] }